Individual library listings on WorldCat.org display a library's name, location, "deep" links to local catalog records, and sometimes links to the library's "Ask a Librarian" virtual reference service, links to the library’s profile page on WorldCat.org and a general information page on the library's Web site. All displayed links and information are drawn from base URLs and other information the library has entered in its institutional profile within the WorldCat Registry. The WorldCat Registry is a free service that allows libraries to manage data commonly shared with vendors, funding bodies and other organizations in a single location.
Although the base URL used for WorldCat.org deep links to an OPAC can also be managed from the WorldCat Services Administrative Module (Linking tab > Web Library Catalogs page), OCLC libraries whose holdings are visible in WorldCat.org are strongly encouraged to maintain the more complete profile provided by the WorldCat Registry. Information entered there is utilized by the WorldCat.org and FirstSearch interfaces.